Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.004 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'scripts': 0.03; 'explicitly': 0.05; 'caller': 0.09; 'override': 0.09; 'subject:Why': 0.09; 'subject:module': 0.09; 'belongs': 0.16; 'command-line': 0.16; 'make,': 0.16; 'really?': 0.16; 'subject:argparse': 0.16; 'throw': 0.16; 'to:name:python list': 0.16; 'exception': 0.16; 'sat,': 0.16; 'wrote:': 0.18; 'library': 0.18; "shouldn't": 0.24; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'raise': 0.29; 'message-id:@mail.gmail.com': 0.30; 'easier': 0.31; "d'aprano": 0.31; 'libraries': 0.31; 'steven': 0.31; 'subject:the': 0.34; 'could': 0.34; 'but': 0.35; 'received:google.com': 0.35; '(e.g.,': 0.36; 'method': 0.36; 'subject:?': 0.36; 'should': 0.36; 'application': 0.37; 'skip:& 10': 0.38; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'to:addr:python.org': 0.39; 'catch': 0.60; 'ethan': 0.84; 'furman': 0.84; 'message"': 0.84; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=ckbx4/D0X7k6JuaU3d+y3RRylYzhoSfx9uCSod6xWT4=; b=Z5J6VBAeuB68u9+ILa+Lo0QcYt75GIkzM0TAMI8KhV/yM5w6uOGHHt+j8JqKNIjwpA S1eq9FZ6epsQl0tmcxDa7xl7AdDUEk3zW7xdfS9DuVxLVIms2mcIK02rjo3Mm4rmVwIF SkXzigQ5qPZhKSqXyjqmMDnls0qYfF9vU4rtvaCEd6wJx8fveTs5LUeP+qd+CzyBp/c9 AK7mu0EC1idrk5sCcwqfv+dJwCuA7eP6oxeWaduGRdki6BKQCWP7CvZIr/KrV8K1lhwF 6A3kF2LB/xM/gNvCyRtN4ssKndDKF1e5o6igtQyznyCEVwUKeuuzS9kzmtk9OhjS3o7I CfCw== MIME-Version: 1.0 X-Received: by 10.49.41.41 with SMTP id c9mr20318554qel.19.1372480653706; Fri, 28 Jun 2013 21:37:33 -0700 (PDT) In-Reply-To: <51CE3A25.7080300@stoneleaf.us> References: <51CC42E3.3070508@gmail.com> <51ccc190$0$29999$c3e8da3$5496439d@news.astraweb.com> <51CE3A25.7080300@stoneleaf.us> Date: Sat, 29 Jun 2013 12:37:33 +0800 Subject: Re: Why is the argparse module so inflexible? From: Isaac To To: Python List Content-Type: multipart/alternative; boundary=047d7bea3fced34b6904e0438da2 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 57 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1372480662 news.xs4all.nl 15894 [2001:888:2000:d::a6]:52090 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:49403 --047d7bea3fced34b6904e0438da2 Content-Type: text/plain; charset=ISO-8859-1 On Sat, Jun 29, 2013 at 9:36 AM, Ethan Furman wrote: > On 06/27/2013 03:49 PM, Steven D'Aprano wrote: > >> >> Libraries should not call sys.exit, or raise SystemExit. Whether to quit >> or not is not the library's decision to make, that decision belongs to >> the application layer. Yes, the application could always catch >> SystemExit, but it shouldn't have to. >> > > So a library that is explicitly designed to make command-line scripts > easier and friendlier should quit with a traceback? > > Really? > Perhaps put the functionality "handling of the exception of library to sys.exit with a message" into a method so that the user can override it (e.g., so that it just throw the same exception to the caller of the library)? --047d7bea3fced34b6904e0438da2 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On S= at, Jun 29, 2013 at 9:36 AM, Ethan Furman <ethan@stoneleaf.us> wrote:
On 06/27/2013 03:49 PM, St= even D'Aprano wrote:

Libraries should not call sys.exit, or raise SystemExit. Whether to quit or not is not the library's decision to make, that decision belongs to<= br> the application layer. Yes, the application could always catch
SystemExit, but it shouldn't have to.

So a library that is explicitly designed to make command-line scripts easie= r and friendlier should quit with a traceback?

Really?

Perhaps put the functionality "handl= ing of the exception of library to sys.exit with a message" into a met= hod so that the user can override it (e.g., so that it just throw the same = exception to the caller of the library)?
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